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REMOVAL AND INSTALLATION
Thermostat —
3.8L
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Disconnect the upper radiator hose from the coolant hose connection.
3. Remove the thermostat housing. zRemove the bolts.
4. Remove the thermostat. zClean and inspect the water outlet connection.
z Discard the thermostat gasket, and clean and inspect the mating surface.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Gasket Adhesive
TA-
6 or equivalent WSS-
M2G408-
A Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
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5. Clean and inspect the thermostat mating surface at the engine.
6.
NOTE: The thermostat is indexed and must be returned to the original location.
NOTE: Coat the new thermostat gasket with gasket adhesive.
NOTE: Make sure the new O- ring gasket is secure around the thermostat.
To install, reverse the removal procedure.
7. Fill the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section. Klj . 2 ba
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Klj . 3 ba
32003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Thermostat —
4.6L(2V)
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Remove the bolts and coolant outlet connection.
3. Position aside the coolant outlet connection and the upper radiator hose.
4. Remove the thermostat and O- ring seal from the upper intake manifold.
z Inspect the O- ring seal. Install a new seal if necessary.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
22003 Mustang Workshop Manual
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Page 1869 of 4378
5. To install, reverse the removal procedure. Klj . 2 ba
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Page 1870 of 4378

REMOVAL AND INSTALLATION
Thermostat —
4.6L(4V)
Removal and Installation 1. With the vehicle in neutral, position it on a hoist. For additional information, refer to Section 100 -
02 .
2. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
3. Remove the thermostat housing bolts.
4. Remove the coolant thermostat. 1. Separate the thermostat housing.
2. Remove the coolant thermostat and the O- ring seal.
z Inspect the O- ring seal. Install a new seal, if necessary.
5. NOTE: The thermostat is indexed and must be returned to the original location. NOTE: Make sure the new O - ring seal is secure around the thermostat. SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
22003 Mustang Workshop Manual
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Page 1871 of 4378
To install, reverse the removal procedure.
6. Fill the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section. Klj . 2 ba
22003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Bypass Tube —
3.8L
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Remove the upper intake manifold. For additional information, refer to Section 303 - 01A .
3. Remove the bypass hose from the bypass tube.
4. Remove the bolt and remove the bypass tube from the coolant pump.
5. Disconnect the quick connect fitting and remove the bracket bolts and the bypass tube.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...